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18 - Capacitors Questions Answers

Physics >> Electricity >> Capacitors IIT JEE
there is slight mistake in last line of previous question.it was find the work done on the system in the process of inserting the slab.
Asked By: GAURAV MAHATE
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Joshi sir comment

 

initial energy of capacitor = 1/2 CV2

final energy of capacitor = 1/2 KC (V/K)2

difference ?

Physics >> Electricity >> Capacitors IIT JEE
a parallel plate capacitor of plate A and plate seperation d is charged to a potential dif. V and then the battery is disconnected .a slab of dielectric constant K is then inserted between the plates of capacitor so as tofill the space bet. The plates .find the work done in this process.
Asked By: GAURAV MAHATE
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Joshi sir comment

initial energy of capacitor = 1/2 CV2

final energy of capacitor = 1/2 KC (V/K)2

difference ?

Physics >> Electricity >> Capacitors IIT JEE

Calculate potential difference across a and b ,

Asked By: AMIT DAS
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Joshi sir comment

since net potential = 0, answer will be 0 for the given diagram. By interchanging the poles of any one battery this question will become meannigfull so change it and apply Kirchhoff law.

Physics >> Electricity >> Capacitors IIT JEE

a 24.6 mev alpha particle moves towards gold nucleus[atomic no 79] calculate the distance of closest approach of alpha particle

Asked By: SHUBHAM SHARMA
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Joshi sir comment

upto closest approach total KE of α particle will become PE

so use the formula KE = 9*109 * Ze2e/r

here KE = 24.6 mev   convert it into joule first

solve equation for r 

Physics >> Electricity >> Capacitors IIT JEE
a capacitor consists of two metal plates each 10cm by 20cm ,they are seperated by a 2 mm thick insulator with dielectric constant 4.1and dielectric strength 6*10to power7 v/m.what minimum voltage will cause spark in capacitor.
Asked By: GAURAV MAHATE
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Joshi sir comment

V = Ed = 6* 107*0.002

Physics >> Electricity >> Capacitors IIT JEE

Define Potential Energy?

Asked By: SIDDHANT KAPOOR
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Joshi sir comment

Potential energy is the energy of a particle due to its position relative to the reference point taken.

Physics >> Electricity >> Capacitors Medical Exam

Q      Q1=1.5C ,  R1=2M, Q2 =3C&R2=1M WHEN THESE SPHERICAL CAPACITER TOUCHED EACH OTHER THEN CHARGE  WILL MOVE OR NOT . IF MOVE THEN HOW MUCH

(MANIPAL 2012)

Asked By: SARIKA
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Joshi sir comment

on touching, the new ratio of charges = x/y = 2/1                 this is by the formula q1/q2 = C1/C2 = R1/R2           

and x+y = 1.5+3 = 4.5

or 2y+y = 4.5 

or y = 1.5

so 1.5 C will move from second to first.

Physics >> Electricity >> Capacitors IIT JEE

what is the main use of capacitors

Asked By: ASHOK UPPUTURI
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Joshi sir comment

Capacitor :- A capacitor is a device to store energy

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